Python iterator, generator

Iterator 1. What is an iterative object

strings, lists, tuples, dictionaries, and collections can all be used for loops, indicating that they are all iterative.

2. Can iterate protocol

a requirement that can be iterated over is called an iterative protocol. the definition of an iterative protocol is very simple, which is to implement the __iter__ method internally.

Can be iterated by the for loop, in order to iterate, there must be a __iter__ method inside.

And then analyze, what did the __iter__ method do?

Iterative: The interior must contain a __iter__ method.

Python iterator, generator